Inaki Relanzon / Hawksbill turtle (Eretmochelys imbricata) swimming underwater, Nosy Be, North Madagascar.

Alex Mustard / Dugong (Dugong dugon) male and juvenile Golden trevally (Gnathanodon speciosus) swimming over Seagrass (Halophila stipulacea) meadow. Marsa Nabaa, Marsa Alam, Egypt.

Alex Mustard / Green turtle (Chelonia mydas) feeding on Seagrass (Halophila stipulacea), blowing sand out of nostrils, on sea floor. Marsa El Shouna, Marsa Alam, Egypt.

Alex Mustard / Green turtle (Chelonia mydas) resting on sea floor and two juvenile Golden trevally (Gnathanodon speciosus). Marsa El Shouna, Marsa Alam, Egypt.

Alex Mustard / Spinner dolphin (Stenella longirostris) pod socialising close to surface. Fury Shoal, Sataya Reef, Marsa Alam, Egypt.

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) swimming close to surface. Brothers Islands, Egypt.

Alex Mustard / Forster's hawkfish (Paracirrhites forsteri) on a coral reef. Jackson Reef, Tiran, Sinai, Egypt. Strait of Tiran, Gulf of Aqaba, Egypt.

Alex Mustard / Tiger cardinalfish (Cheilodipterus macrodon) male mouth brooding a clutch of eggs behind his sharp teeth. Gubal Island, Egypt. Strait Of Gubal, Red Sea.

Alex Mustard / Yellowtail tang (Zebrasoma xanthurum) male courting a female prior to spawning at dusk on a coral reef. Temple, Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea.

Vincent Grafhorst / River in sandstone cave, Sof Omar Cave, Ethiopia

Vincent Grafhorst / Crater of active volcano at twilight, Erta Ale, Danakil Depression, Ethiopia

Jeff Rotman / Head and gills of juvenile Scalloped hammerhead shark (Sphyrna Lewini), Kane'ohe Bay, Hawaii, Pacific Ocean.

Alex Mustard / Striped mackerel (Rastrelliger kanagurta) shoal swimming with open mouths, filtering for zooplankton. Marsa Shouna, Port Ghalib, Marsa Alam, Egypt. Red Sea

Jordi Chias / Wave breaking over the reef, Table coral (Acropora) Safaga, Egypt, Red Sea.

Jordi Chias / Hawksbill turtle (Eretmochelys imbricata) Port El Ghalib, Egypt, Red Sea.

Jordi Chias / Red Sea anemonefish (Amphiprion bicinctus) in their home, a Sea anemone (Heteractis magnifica), on a coral reef. Big Brother island, Red Sea. Egypt.

Eric Baccega / Mountain gorilla (Gorilla beringei beringei) juvenile female stretching hand out towards camera, member of the Kabirizi group, Virunga National Park, North Kivu, Democratic Republic of Congo, Africa,...

Vincent Grafhorst / Stream in Harenna Forest, Bale Mountains National Park, Ethiopia

Vincent Grafhorst / Tree with epiphytes, Harenna Forest, Bale Mountains National Park, Ethiopia

Vincent Grafhorst / Salt flat, Lake Asale, Danakil Depression, Ethiopia

Vincent Grafhorst / Dromedary (Camelus dromedarius) caravan transporting salt across salt flat, Lake Asale, Danakil Depression, Ethiopia

Luis Quinta / Beach at the north of Principe Island, Democratic Republic of Sao Tome and Principe, Gulf of Guinea.

Alex Mustard / Striped mackerel (Rastrelliger kanagurta) mouth wide open as it swims through the water, filtering zoopankton with its gill rakers. Marsa Shouna, Port Ghalib, Marsa Alam, Egypt. Red Sea

Ingo Arndt / Black garden ants {Lasius niger} feeding on cricket Germany, Europe

Ingo Arndt / Barbary ape feeding on grass {Macaca sylvanus} Morocco

Ingo Arndt / African chameleon {Chamaeleo africanus} portrait, captive, from north-west Africa

Ingo Arndt / Gelada baboon subadult males grooming {Theropithecus gelada} Simien Mt NP, Ethiopia

Ingo Arndt / Gelada baboon male portrait {Theropithecus gelada} Simien Mt NP, Ethiopia

Ingo Arndt / Gelada baboon {Theropithecus gelada} juveniles playing on rocks, Simien Mountains NP, Ethiopia

Ingo Arndt / Gelada baboon males threat display {Theropithecus gelada} Simien Mt NP, Ethiopia

Ingo Arndt / Gelada baboon troop on rock {Theropithecus gelada} Simien Mt NP, Ethiopia

Ingo Arndt / Gelada baboon juvenile group {Theropithecus gelada} sitting on rocks, Simien Mt NP, Ethiopia

Ingo Arndt / Gelada baboon {Theropithecus gelada} male, Simien Mountains NP, Ethiopia

Ingo Arndt / Gelada baboon male threat display {Theropithecus gelada} Simien Mt NP, Ethiopia

David Pattyn / Common brown lemur (Eulemur fulvus) jumping amongst branches, Anjajavy Private Reserve, north west Madagascar.

David Pattyn / Common brown lemur (Eulemur fulvus) portrait, Anjajavy Private Reserve, north west Madagascar.

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) male chomps on soft coral. Jackson Reef, Sinai, Egypt. Strait of Tiran, Red Sea.

Alex Mustard / Whitetip shark (Carcharhinus longimanus) head on beneath the surface. Rocky Island, Egypt. Red Sea

Christophe Courteau / Lava Lake at night in the crater of Nyiragongo Volcano, Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Christophe Courteau / Lava Lake at night in the crater of Nyiragongo Volcano, Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Christophe Courteau / Steam rising from the crater of Nyiragongo Volcano. Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Roland Seitre / Dromedary camel (Camelus dromedarius) calf Oriental Great Erg sand dunes, Jbil National Park, Tunisia.

Georgette Douwma / Blue triggerfish (Pseudobalistes fuscus). Egypt, Red Sea. Indo-Pacific.

Georgette Douwma / Big-eye fish (Priacanthus hamrur). Egypt, Red Sea.

Jabruson / Mozambican children with captive Yellow Baboon youngster (Papio cynocephalus) young animal caught during troop crop raiding. Pemba to Montepuez highway, north-eastern Mozambique, November 2011. Specia...

Thomas Marent / Gelada Baboon (Theropithecus gelada) male running, Simien Mountains National Park, Ethiopia

Thomas Marent / Gelada Baboon (Theropithecus gelada) male, Simien Mountains National Park, Ethiopia

Thomas Marent / Gelada Baboon (Theropithecus gelada) male, Simien Mountains National Park, Ethiopia

Thomas Marent / Gelada Baboon (Theropithecus gelada) mother carrying young, Simien Mountains National Park, Ethiopia

Thomas Marent / Gelada Baboon (Theropithecus gelada) young, Simien Mountains National Park, Ethiopia

Thomas Marent / Gelada Baboon (Theropithecus gelada) young feeding on lichen, Simien Mountains National Park, Ethiopia

Thomas Marent / Gelada Baboon (Theropithecus gelada) male, Simien Mountains National Park, Ethiopia

Thomas Marent / Gelada Baboon (Theropithecus gelada) male and females huddling for warmth, Simien Mountains National Park, Ethiopia

Thomas Marent / Gelada Baboon (Theropithecus gelada) group huddling for warmth, Simien Mountains National Park, Ethiopia

Alex Mustard / Napoleon wrasse (Cheilinus undulatus) super male, patrolling coral, Ras Mohammed Marine Park, Sinai, Egypt. Red Sea

Alex Mustard / Scissortail sergeants (Abudefduf sexfasciatus) swimming over hard corals (Acropora sp.) on shallow reef at sunset, split level view. Gubal Island, Egypt. Red Sea.

Alex Mustard / Group of predators hunting together, in an example of 'Nuclear foraging'. The Moray eel (Gymnothorax javanicus) flushes out prey, and is followed by a Napolean wrasse (Cheilinus undulatus) and a Bluef...

Alex Mustard / Reef octopus (Octopus cyanea) portrait near wreck. Gubal Island, Egypt. Red Sea.

Dave Watts / Northern bald ibis (Geronticus eremita) feeding, Morocco, Critically endangered species.

Dave Watts / Hermit ibis (Geronticus eremita) flock in flight, Morocco. Critically endangered.

Bruno D'Amicis / Fennec fox (Vulpes zerda) wild caught adult, kept in sheep pen in village, Kebili Governorate. Tunisia, April. Winner of the Fritz Polking Portfolio Award of the GDT Competition 2015.

Nick Garbutt / Madagascar sunset moth (Chrysiridia rhipheus) resting on tree. Masoala Peninsula, north east Madagascar. Controlled conditions.

Dave Watts / Addax (Addax nasomaculatus) rear view, captive in Rabat Zoo, Morocco. Critically endangered.

Dave Watts / Hermit ibis (Geronticus eremita) colony, near Tamri, Morocco. Critically endangered.

Bruno D'Amicis / Sand viper (Cerastes vipera) sidewinding on sand dunes. Grand Erg Oriental, Kebili Governorate. Tunisia.

Bruno D'Amicis / Desert monitor (Varanus griseus) moving across sand dunes, showing characteristic tracks, in the Sahara, Tunisia.

Bruno D'Amicis / Fennec fox (Vulpes zerda) adult at night digging for prey among the roots of Retam broom shrub. Grand Erg Oriental, Kebili Governorate, Tunisia. Taken with remote camera trap.

Bruno D'Amicis / Fennec fox (Vulpes zerda) foraging at night, Grand Erg Oriental, Kebili Governorate. Tunisia. Taken with remote camera trap.

Bruno D'Amicis / Fennec fox (Vulpes zerda) adult at night in sand dunes with starry sky, Grand Erg Oriental, Kebili Governorate, Tunisia. Camera trap image

Bruno D'Amicis / Tenebrionid beetle (Tenebrionidae) crossing Fennec fox (Vulpes zerda) tracks on sand. Grand Erg Oriental, Kebili Governorate. Tunisia.

Bruno D'Amicis / Fennec fox (Vulpes zerda) pups playing outside of den, Grand Erg Oriental, Kebili Governorate. Tunisia.

Bruno D'Amicis / Fennec fox (Vulpes zerda) pups playing outside of den, Grand Erg Oriental, Kebili Governorate. Tunisia.

Bruno D'Amicis / Fennec fox (Vulpes zerda) pups playing outside of den, Grand Erg Oriental, Kebili Governorate. Tunisia.

Bruno D'Amicis / Fennec fox (Vulpes zerda) Grand Erg Oriental, Kebili Governorate. Tunisia.

Bruno D'Amicis / Fennec fox (Vulpes zerda) ears above sand dunes, Grand Erg Oriental, Kebili Governorate. Tunisia.

Bruno D'Amicis / Fennec fox (Vulpes zerda) pup, aged a few weeks, caught in the wild and shown at a famous camel trekking site for tourists in the hope of either selling it or being paid for photos, Kebili Governorate...

Bruno D'Amicis / Fennec fox (Vulpes zerda) Sultan tied up in front of a tourist shop in the souk, Douz, Kebili Governorate. Tunisia. Unwittingly, tourists support the capture of fennec fox cubs from the wild by payi...

Bruno D'Amicis / Fennec fox (Vulpes zerda) displayed in the market (souk), of a Tunisian town. This species is adapted to silence and solitude of the desert, this individual that had been caught as an adult showed cle...

Bruno D'Amicis / Fennec fox (Vulpes zerda) displayed in the market (souk), of a Tunisian town. This species is adapted to silence and solitude of the desert, this individual that had been caught as an adult showed cle...

Bruno D'Amicis / Fennec fox (Vulpes zerda) few-weeks old pup caught in the wild and shown at a famous camel trekking site for tourists in the hope of either selling it or being paid for photos, Kebili Governorate. Tun...

Juan Manuel Borrero / Argan tree (Argania spinosa) fruits, cultivated plant, endemic to Morocco.

Roland Seitre / Dromedary (Camelus dromedarius) mother and calf in desert, Sahara Desert, Jebil National Park, Tunisia

Roland Seitre / Dromedary (Camelus dromedarius) mother and calfs in desert, Jebil National Park, Sahara Desert, Tunisia

Roland Seitre / Dromedary (Camelus dromedarius) mother and calf in desert, Jebil National Park, Sahara Desert, Tunisia

Roland Seitre / Dromedary (Camelus dromedarius) mother and calf in desert, Jebil National Park, Sahara Desert, Tunisia

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by pilotfish (Naucrates ductor) as it cruises beneath the surface of the Red Sea, close to Little Brother Island. The Brothers Islands, Egy...

Markus Varesvuo / Pharaoh eagle owl (Bubo ascalaphus) on sand, Morocco, March.

Edwin Giesbers / Barbary ground squirrel (Atlantoxerus getulus) looking over rock, Fuerteventura, Canary Islands. Introduced from North Africa.

Edwin Giesbers / Barbary ground squirrels (Atlantoxerus getulus) fighting, Fuerteventura, Canary Islands. Introduced from North Africa.

Jordi Chias / Hawksbill turtle (Eretmochelys imbricata) swimming over reef, Red Sea, Egypt

Markus Varesvuo / African Blue tit (Cyanistes teneriffae) Morocco, February

Steve O. Taylor (GHF) / Rock arch in the far north of Niger, 2005.

Bruno D'Amicis / Young Fennec fox (Vulpes zerda) cub, offered for sale to the photographer by the young man who trapped it in the desert. Kebili Region, Tunisia. May 2014. Winner of the World in our Hands category, Wi...

Markus Varesvuo / Alpine choughs (Pyrrhocorax graculus) flying over snow covered mountain with tracks from snow boarders in the snow, Morocco, February 2009

Gavin Hellier / Timelapse from day to night with clouds forming, looking over Djemaa el-Fna market, Marrakech, Morocco, 2011.

Gavin Hellier / Timelapse from day to night looking over Djemaa el-Fna market, Marrakech, Morocco, 2011.